2023 Mitsubishi Outlander Has Rough Idle

Troubleshooting Causes of Rough Idle in Your 2023 Mitsubishi Outlander and How to Resolve Them

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Reviewed by
Devin Cabugcal
Written by RepairPal Car Genius
Updated January 14, 2025
0%
21% chance it's the
Spark Plugs
0%
15% chance it's the
Ignition Coil
0%
64% chance it's
Something else
The most common reasons a 2023 Mitsubishi Outlander has rough idle are a vacuum leak, an issue with the spark plugs, or a problem with the ignition coil.
  • Spark Plugs: Worn or fouled spark plugs can lead to misfires, poor fuel economy, and difficulty starting the engine.
  • Ignition Coil: A faulty ignition coil can cause misfires, rough idling, and difficulty starting the engine due to inadequate spark delivery to the spark plugs.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 2023 Mitsubishi Outlander has rough idle?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Brake caliper failure occurs in two different ways, and they create different symptoms.

The caliper can become stuck, in which case it won't release the brake pads. The seized caliper will cause the vehicle to brake constantly on one side, forcing the car to move toward that side. This pulling will be accompanied by a strong odor from one wheel.

Another way calipers fail is by leaking. If the caliper leaks, the brake pedal will feel too easy to push, and will sink all the way to the floor when held. Braking will become less effective the longer this goes on. There may also be brake fluid leaking onto the wheel.

Here are a few common symptoms of worn-out brake pads:

  1. Low brake pad warning light is on: Not all vehicles are equipped with this system, but if yours is, this dashboard indicator light will likely be the first signal it’s time to replace your brake pads.
  2. Brakes start to squeal regularly: This is often one of the first signs of worn brake pads and is caused by a metallic piece built into brake pads for this exact purpose. This part contacts the brake rotor to make a squealing or whining noise when the pads are low.
  3. Brakes make loud grinding noise: If not addressed early enough, your brake pads may get so worn that the metal backing plate of the pad grinds against the metal rotor.
  4. Brake pads look thin: You may be able to visually check your brake pad thickness to determine if they need replacement.

Brake rotors are mainly maintenance free, but when they have been subjected to abnormally hard use, the heat they absorb can cause the metal to turn blue, and cracking to occur. When this occurs, customers often specify they have lost braking power, or the vehicle's brakes are making noise. There may be no symptoms at all related to changing the brake rotors, since it is recommended to change brake rotors on most modern vehicles when performing a standard brake service.

Most often, a brake system inspection will just be a routine portion of manufacturer specified maintenance, and will be performed at mileage intervals. In those cases, there will likely be no symptoms. However, when a brake system makes a funny noise, causes vibration, is hard to use, will not slow the vehicle, prevents the vehicle from driving, makes the vehicle pull to one side, or leaks brake fluid, the vehicle will need a visit dedicated to the inspection of the brake system.

What are the initial diagnostic steps to take for a rough idle in a 2023 Mitsubishi Outlander?

When faced with a rough idle in your 2023 Mitsubishi Outlander, start by checking the spark plugs, as they are often the simplest and most accessible components to inspect. Worn or dirty spark plugs can significantly affect engine performance, so ensure they are in good condition. Next, examine the air filter; a clogged filter can restrict airflow, leading to an uneven idle. If these initial checks do not resolve the issue, turn your attention to the fuel system. Inspect the fuel injectors, fuel filter, and fuel pump for any signs of malfunction, as these can directly impact engine performance. Utilizing an OBD-II scanner to check for error codes can provide valuable insights into any underlying issues that may not be immediately visible. Additionally, inspect for vacuum leaks in hoses and connections, as these can disrupt the air-fuel mixture and contribute to a rough idle. Finally, consider the throttle body; a dirty or malfunctioning throttle body can affect idle speed, so cleaning or repairing it may be necessary. By following this structured diagnostic approach, you can effectively identify and address the causes of a rough idle in your vehicle.

What are the common problems that could cause a rough idle in a 2023 Mitsubishi Outlander?

When dealing with a rough idle in your 2023 Mitsubishi Outlander, it's essential to understand the common issues that may be at play. One of the first things to check is the air filter; a dirty or clogged filter can significantly restrict airflow to the engine, leading to performance issues. Next, inspect the spark plugs, as worn or faulty plugs can cause misfiring, which directly contributes to a rough idle. Additionally, look for vacuum leaks, as these can disrupt the air-fuel mixture, further exacerbating the problem. Fuel system components, including the fuel filter and fuel pump, should also be examined, as any malfunction here can impact engine performance. Don't overlook the mass airflow sensor; if it's not functioning correctly, it can throw off the air-fuel mixture, resulting in an unstable idle. Lastly, consider the EGR valve, as a faulty valve can interfere with the combustion process, leading to rough idling. By systematically checking these components, you can effectively diagnose and address the issues causing a rough idle in your Outlander, ensuring smoother operation and improved performance.

How urgent is it to address the rough idle in my 2023 Mitsubishi Outlander?

Addressing a rough idle in your 2023 Mitsubishi Outlander is crucial for maintaining the vehicle's performance and longevity. Ignoring this symptom can lead to a cascade of problems, including decreased fuel efficiency and engine misfires, which not only affect your driving experience but can also result in costly repairs down the line. A rough idle often indicates underlying issues such as faulty spark plugs, fuel system malfunctions, or air intake problems that, if left unaddressed, could escalate into more severe engine damage. Moreover, a poorly running engine can pose safety risks, making it imperative to consult a qualified mechanic or dealership for a thorough diagnosis and timely repairs. By prioritizing the resolution of a rough idle, you not only enhance your vehicle's performance but also safeguard against potential hazards and expensive fixes in the future.

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